Steam-engine



(No Model.)

G. SMITH.

STEAM ENGINE.

No. 491,141. Patented Peb, 7, 1893.

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i UNITED STATES PATENT OFFICE.

GEORGE SMITH, OF LITTLE ROOK, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, OF NINE-TENTHS TO DIXIE A. NEAL, ORRIN B. NEAL, AFTON H.

NEAL, BLAN A. NEAL, JOHN L. BOOTH, A. G. GRIFFIN, T. S. ANDERSON, J. H.

EMISON, J. M. WRIGHT, AND W. P. DAVIS, OF EL PASO, AND JOHN A. PHELPS,

OF WHITE COUNTY, ARKANSAS.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 491,141, dated February 7, 1893.

Application filed October 3, 1892. Serial No. 4471634- (NO 111054510 To all whom it may concern:

Be it known that I, GEORGE SMITH, a citizen of the United States, residing at Little Rock, in the county of Pulaski and State of Arkansas, have invented certain new and useful Improvements in Steam-Engines-Locomotive, Stationary, or Marine; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention has relation to improvements in steam engines, locomotive, stationary, or marine.

In the accompanying drawings: Figure 1 is a vertical sectional view of my invention. Fig. 2 is a view of the valvel on its seat. Fig. 3 is a cross section of the sectional conduit, and Fig. 4c sho`ws the valve seat.

In referring to the drawings letters of reference are as follows: Steam chests, c and c2; set screws, a and a2; valve yokes, y and y2; valves, fu and o2; valve seats, s and s2; valve seat plates, z and z2; ad mission ports, p and p2; valve rod, fr; stuiiing-boxes, s and le; piston rod, o; cylinder heads, h and h2; cylinder, q; piston heads, h3 and h4; exhaust ports, f and f2; sectional conduit, d and d2; bosses, b" and b2; steam pipes, p3 and p4 and p5; admission pipe, p6; T-elbow, e. The cylinder, q, is constructed to work two pistons.

The center of said cylinder is perforatedl with adouble set of holes, f', f2, through lwhich the dead steam passes into the exhaust jacket, each piston serving as its own exhaust valve, and discharging its own steam. The freedom of this exhaust enables the steam to be expanded farther than in any of the ordinary types. By doing away with the exhaust :cavity in the ordinary valve, and using the admission valve solely as an admission valve, and not as a combined admission and exhaust valve, it is rendered practically balanced. There is no surplus space between valve seat and cylinder, the port being straight and direct from the valve seat to the cylinder; this, together with its location at the extreme end of the cylinder effects an immense saving of dead space anda corresponding saving of steam. This engine can be runat a higher rate of piston speed than any single piston engine by reason of the freedom of its exhaust.

Another feature of the valve gear is that the valve seat plates, z', z2, are detachable from their steam chests, c and c2, and also from the main cylinder, q. This makes their renewal or repair the simplest possible. The steam chests, c and c2, are situated at each end of the cylinder and are connected by steam pipes, p3, p5, screwing into a T-elbow e,into which the supply pipe, p6, also screws. The governor is also connected with supply pipe, p6. The valve rod, r, also passes through the pipes, 103, p5, thus obviating the necessity for a stuffing box in steam chest c2. This rod, fr', is connected with valves 'by yokes, y', y2, and set screws, a', a2; The sectional conduit, d, d2, is `made in two parts and bolted together in contact with the raised bosses, h', b2, which encircle the cylinder q. The construction of the sectional conduit and the raisedl bosses enablesl the exhaust ports,

f, f2, to be partially or Wholly closed by merely slipping the jacket, d', d2, around on the cylinder bosses, b', b2.

Having described my invention what I claim as new and desire to secure by Letters Patent, iszk 1. In a steam engine the combination of the steam admission valves at each end of the cylinder, with the two sets of exhaust ports located centrally in the cylinder and the two pistons which control the exhaust ports.

2.. In a steam engine the combination of the twopistonswith thecylinderprovidedwithtwo sets of exhaust ports centrally located in the cylinderV and controlled'I by the pistons, the

distance between the ports being such that which connects the exhaust ports to the main 1o they are opened to each side of` one of the exhaust pipe.

pistons at the end of its stroke, whereby the In testimony whereof Ialix mysignature in steam may be exhausted each side of the presence of two Witnesses.

5 piston.

3. In a steam engine the combinationof the GEORGE SMITH. cylinder provided with two sets of vexhaust Witnesses: l ports located centrally in the cylinder with a W. L. HARKRIDER, sectional conduit attached to the cylinder, H. K. ADAMS. 

